280 THE CANADIAN ENTOMOLOGIST. 



2 2. Antennas with white annulus, rufous at base, black at apex; abdomen 

 and petiole rufous, smooth polished, without 

 carinse lineolatus, Provancher. 



Antennas without white annulus 23. 



23. More or less shiny; rufous, stains of black on mesothorax ; third 

 abdominal segment rufous ; legs all red ; areolet in wings moderate 

 in size ; base of metathorax punctured, carinate ; poslpetiole not 

 very broad, polished, but sparingly 

 punctured Californicus, Cresson. 



Opaque ; pale ferruginous ; base of third abdominal segment and 

 apex of posterior tibiae black ; areolet in wings very large ; base of 

 metathorax rugose and without carinas ; postpetiole very broad and 

 shagreened *opacitus, Davis. 



1. P. CLARUS, Cresson. 9- 6- 



1867. Ichneumon clar^is, Cresson, V- Tr. Amer. Ent. Soc, Vol. 

 I., p. 297. 



1877. Platylahjis darus, Cresson, V- $,  I'''- Am. Ent. Soc, 

 VI., p. 199. 



1886. Platylabus magni_ftci/s, Provancher, ?. Add. Faun. Hym. 

 Can., p. 36. 



This, and the following species, are easily distinguished by their large 

 size and brilliant blue colour. Areola, shown in figure i, from 

 the description jnagnificus, Prov., must belong here. 



Habitat. — Mass. ; Becancour, Can. {magnijiais). 



Type in coll. American Ent. Society. 



2. P. IVIETALLICUS, U. sp. ^ . $ . 



Bright metallic blue ; wings hyaline ; white annulus on antennse ; 

 metathoracic area shown in fig. 2. Length of antennc-e 12 mm.; 

 of insect i 2 mm. 



5 . Metallic blue ; anterior orbital line interrupted medially, short 

 posterior line, annulus on antennte, front tibiae and apex of femora 

 anteriorly, trace on middle femora and tibia? anteriorly, white ; 

 remainder of front 4 tibiae and tarsi and posterior tarsi ferruginous ; 

 clypeus broadly truncate, labrum prominent, face narrowed in 

 front of eyes ; base of clypeus marked by suture, two longitudinal, 



